A square cable for a communication device

Abstract

The present invention discloses a square cable for communication equipment, which includes a rectangular conductor. An ethylene cross-linked polyethylene insulation layer is coated on the outer side of the rectangular conductor. Two rectangular conductors are placed side by side to form a square cable core. A square tinned copper wire braided armor layer, a square calcined mica tape fire-resistant wrapping layer, a water-blocking aramid yarn filling layer and a square flame-retardant low-smoke and halogen-free outer sheath are sequentially coated outside the square cable core. In the present invention, the conductor is designed in a rectangular shape, and the overall cable is designed in a square shape. Under the condition of the same cross-sectional area, its transmission surface area is larger than that of a circular cable, improving the transmission efficiency, and a lot of materials can be saved, which is beneficial to reducing the mass and volume of the cable. The flame-retardant low-smoke and halogen-free outer sheath of the present invention can effectively improve the surface activity of silica powder and diatomaceous earth powder, and improve the compatibility between them and the polypropylene substrate, thereby effectively improving the mechanical stability strength of the sheath material.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to a square cable for communication equipment. Background Art

[0002] When an alternating current passes through a conductor, due to the skin effect of charges, the current is transmitted along the outer surface of each conductor. Traditional cables are basically circular in design. When the area is the same, the circumference of a circle is the shortest. With the development of the country in the fields of wind energy and solar energy power generation, etc., the society has higher and higher requirements for the energy conversion rate of transformers, inverters, etc. Thus, traditional circular cables are increasingly unable to meet the requirements of industry development. They not only have low transmission efficiency, but also have large mass and volume, and are very inconvenient to use. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention proposes a square cable for communication equipment.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A square cable for communication equipment includes a rectangular conductor. An ethylene propylene rubber insulation layer is coated on the outside of the rectangular conductor. Two rectangular conductors are placed side by side to form a square cable core. A square tinned copper wire braided armor layer, a square calcined mica tape fire-resistant wrapping layer, a water-blocking aramid yarn filling layer and a square flame-retardant low-smoke and halogen-free outer sheath are sequentially coated outside the square cable core.

[0006] Fine steel wires are respectively inserted inside the four corners of the square flame-retardant low-smoke and halogen-free outer sheath.

[0007] The square flame-retardant low-smoke and halogen-free outer sheath is composed of the following raw materials in parts by weight:

[0008] Trimethylolpropane 6 - 9, zinc hydroxystannate 4 - 6, diacetone acrylamide 3 - 5, melamine 10 - 20, 35 - 37% formaldehyde aqueous solution 30 - 40, polypropylene 100 - 140, bisphenol A phosphite 10 - 12, silica powder 5 - 7, diatomaceous earth powder 10 - 17.

[0009] The preparation method of the square flame-retardant low-smoke and halogen-free outer sheath includes the following steps:

[0010] (1) Take silica powder and diatomaceous earth powder and mix them. Add deionized water 20 - 30 times the weight of the mixture and stir evenly. Then add diacetone acrylamide and stir evenly to obtain an aqueous dispersion.

[0011] (2) Mix 10 - 20 parts of melamine with 35 - 37% aqueous formaldehyde solution, keep stirring at 70 - 75 °C for 10 - 20 minutes, adjust the pH to 8 - 9, keep reacting for 2 - 3 hours, add the above aqueous dispersion, stir evenly, place it in a vacuum oven at 30 - 35 °C, after removing water, adjust the pH to 5 - 6 with citric acid, and cure in an oven at 50 - 60 °C for 7 - 8 hours, then discharge and cool to obtain the modified resin;

[0012] (3) Take trimethylolpropane, mix it with zinc hydroxystannate, add it to anhydrous ethanol which is 10 - 15 times the weight of the mixture, stir evenly, add the above modified resin, keep stirring at 80 - 90 °C for 1 - 2 hours, filter by suction, wash the precipitate with water, and dry it in vacuum to obtain the composite filler;

[0013] (4) Take the above composite filler, mix it with polypropylene and bisphenol A phosphite, stir evenly, feed it into an extruder, melt and extrude, and then cool to obtain the product.

[0014] The advantages of the present invention are as follows: 1. The conductor of the present invention adopts a rectangular design, and the whole cable adopts a square design. Under the condition of the same cross-sectional area, its transmission surface area is larger than that of a circular cable, improving the transmission efficiency, and a lot of materials can be saved, which is beneficial to reducing the mass and volume of the cable.

[0015] 2. The two rectangular conductors of the present invention can achieve low inductance and large capacitance, and can reduce the influence of clutter signals on signal transmission;

[0016] 3. The flame-retardant low-smoke and halogen-free outer sheath adopted by the present invention is based on polypropylene. The added silica powder, diatomite powder and zinc hydroxystannate all have good smoke suppression and flame retardant effects. The present invention blends silica powder and diatomite powder with melamine and formaldehyde to prepare resin, which can effectively improve the surface activity of silica powder and diatomite powder and enhance their compatibility with the polypropylene base material, thereby effectively improving the mechanical stability strength of the sheath material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Reference numerals: rectangular conductor 1, cross-linked polyethylene insulation layer 2, square tinned copper wire braided armor layer 3, square calcined mica tape fire-resistant wrapping layer 4, water-blocking aramid yarn filling layer 5, square flame-retardant low-smoke and halogen-free outer sheath 6, fine steel wire rope 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Example 1

[0021] A square cable for communication equipment includes a rectangular conductor 1. An ethylene cross-linked polyethylene insulation layer 2 is coated on the outer side of the rectangular conductor 1. Two rectangular conductors 1 are placed side by side to form a square cable core. A square tinned copper wire braided armor layer 3, a square calcined mica tape fire-resistant wrapping layer 4, a water-blocking aramid yarn filling layer 5, and a square flame-retardant low-smoke and halogen-free outer sheath 6 are successively coated on the outside of the square cable core.

[0022] Fine steel wires 7 are respectively penetrated inside the four corners of the square flame-retardant low-smoke and halogen-free outer sheath 6 to increase the tensile performance of the cable.

[0023] The flame-retardant low-smoke and halogen-free outer sheath 6 is composed of the following raw materials in parts by weight:

[0024] Trimethylolpropane 6, zinc hydroxystannate 4, diacetone acrylamide 3, melamine 10, 35% aqueous formaldehyde solution 30, polypropylene 100, bisphenol A phosphite 10, silica powder 5, diatomite powder 10.

[0025] A preparation method of the square flame-retardant low-smoke and halogen-free outer sheath includes the following steps:

[0026] (1) Take silica powder and diatomite powder and mix them. Add them to deionized water 20 times the weight of the mixture, stir evenly, add diacetone acrylamide, and stir evenly to obtain an aqueous dispersion.

[0027] (2) Take 10 of melamine and 35% aqueous formaldehyde solution and mix them. Keep stirring at 70 °C for 10 minutes, adjust the pH to 8, keep reacting for 2 hours, add the above aqueous dispersion, stir evenly, place it in a vacuum oven at 30 °C, remove water, adjust the pH to 5 with citric acid, and cure in an oven at 50 °C for 7 hours, then discharge and cool to obtain a modified resin.

[0028] (3) Take trimethylolpropane, mix it with zinc hydroxystannate, add it to anhydrous ethanol 10 times the weight of the mixture, stir evenly, add the above modified resin, keep stirring at 80 °C for 1 hour, filter by suction, wash the precipitate with water, and dry it in vacuum to obtain a composite filler.

[0029] (4) Take the above composite filler, mix it with polypropylene and bisphenol A phosphite, stir evenly, send it into an extruder, melt and extrude, and cool to obtain it.

[0030] Example 2

[0031] A square cable for a communication device, comprising a rectangular conductor 1, with a crosslinked polyethylene insulation layer 2 coated on the outside of the rectangular conductor 1. Two rectangular conductors 1 are placed side by side to form a square cable core, and a square tinned copper wire braided armor layer 3, a square calcined mica tape fire-resistant wrapping layer 4, a water-blocking aramid yarn filling layer 5, and a square flame-retardant low-smoke and halogen-free outer sheath 6 are successively coated on the outside of the square cable core.

[0032] Fine steel wires 7 are respectively penetrated through the inner sides of the four corners of the square flame-retardant low-smoke and halogen-free outer sheath 6 to increase the tensile performance of the cable.

[0033] The square flame-retardant low-smoke and halogen-free outer sheath 6 is composed of the following raw materials in parts by weight:

[0034] Trimethylolpropane 9, zinc hydroxy stannate 6, diacetone acrylamide 5, melamine 20, 37% aqueous formaldehyde solution 40, polypropylene 140, bisphenol A phosphite 12, silica powder 7, diatomite powder 17.

[0035] A preparation method for the square flame-retardant low-smoke and halogen-free outer sheath, comprising the following steps:

[0036] (1) Take silica powder and diatomite powder, mix them, add them to deionized water 30 times the weight of the mixture, stir evenly, add diacetone acrylamide, and stir evenly to obtain an aqueous dispersion;

[0037] (2) Take 20 of melamine and 37% aqueous formaldehyde solution, mix them, keep them warm and stir at 75 °C for 20 minutes, adjust the PH to 9, keep the reaction at a constant temperature for 3 hours, add the above aqueous dispersion, stir evenly, place it in a vacuum oven at 35 °C, remove water, adjust the PH to 6 with citric acid, cure in an oven at 60 °C for 8 hours, discharge and cool to obtain a modified resin;

[0038] (3) Take trimethylolpropane, mix it with zinc hydroxy stannate, add it to anhydrous ethanol 15 times the weight of the mixture, stir evenly, add the above modified resin, keep it warm and stir at 90 °C for 2 hours, filter by suction, wash the precipitate with water, and dry it in vacuum to obtain a composite filler;

[0039] (4) Take the above composite filler, mix it with polypropylene and bisphenol A phosphite, stir evenly, feed it into an extruder, melt and extrude, and cool to obtain it.

[0040] The corners of the square cable all adopt arc transitions, and the appearance is good-looking.

[0041] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A square cable for a communication device, characterized in that, It includes a rectangular conductor, with a crosslinked polyethylene insulation layer coated on the outside of the rectangular conductor. Two rectangular conductors are placed side by side to form a square cable core. Outside the square cable core, there are successively coated with a square tinned copper wire braided armor layer, a square calcined mica tape fire-resistant wrapping layer, a water-blocking aramid yarn filling layer, and a square flame-retardant low-smoke and halogen-free outer sheath; The outer sheath is composed of the following raw materials in parts by weight: Trimethylolpropane 6 - 9, zinc hydroxystannate 4 - 6, diacetone acrylamide 3 - 5, melamine 10 - 20, 35 - 37% formaldehyde aqueous solution 30 - 40, polypropylene 100 - 140, bisphenol A phosphite 10 - 12, silica powder 5 - 7, diatomite powder 10 - 17; The preparation method of the outer sheath includes the following steps: (1) Take silica powder and diatomite powder and mix them. Add them to deionized water 20 - 30 times the weight of the mixture, stir, add diacetone acrylamide, and stir to obtain an aqueous dispersion; (2) Take melamine and 35 - 37% formaldehyde aqueous solution and mix them. Keep stirring at 70 - 75 °C for 10 - 20 minutes, adjust the pH to 8 - 9, keep reacting for 2 - 3 hours, add the above aqueous dispersion, stir, place it in a vacuum oven at 30 - 35 °C, remove water, adjust the pH to 5 - 6 with citric acid, and cure in an oven at 50 - 60 °C for 7 - 8 hours, discharge and cool to obtain a modified resin; (3) Take trimethylolpropane, mix it with zinc hydroxystannate, add it to anhydrous ethanol 10 - 15 times the weight of the mixture, stir, add the above modified resin, keep stirring at 80 - 90 °C for 1 - 2 hours, filter by suction, wash the precipitate with water, and dry it in vacuum to obtain a composite filler; (4) Take the above composite filler, mix it with polypropylene and bisphenol A phosphite, stir, feed it into an extruder, melt and extrude, and cool to obtain.

2. The square cable for communication equipment according to claim 1, wherein Fine steel wires are respectively penetrated inside the four corners of the square flame-retardant low-smoke and halogen-free outer sheath.

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